JP5918957B2 - Deformed pipe and its laying method - Google Patents

Description

  The present invention relates to a deformed pipe made of cast iron having at least one deformed portion and a method for laying the deformed pipe.

  Conventionally, when a metal pipe such as a ductile cast iron pipe is laid along a pipeline, the pipe is often cut. For example, if the pipe length does not match in the pipe joint and the pipe joint, the length of the pipe is cut by cutting the insertion side to the required length at the pipe laying site. Is often adjusted. (For example, refer to Patent Document 1).

  By the way, for example, in a deformed pipe having a deformed portion such as a branch port portion, a valve portion, or a bent portion, the deformed portion such as a branch port portion, a valve portion, or a bent portion is positioned so as to be in an optimal installation position. It needs to be connected to the pipelines on both sides. At this time, for example, when the pipes on both sides of the deformed pipe are already arranged, cutting of the existing pipe lines is restricted in order to avoid large-scale construction, and therefore it is necessary to cut the deformed pipe. It is not necessary to cut the entire pipe length of the deformed pipe to a predetermined length because it is equipped with a section, and it is wasted with a pipe length that can be connected to the pipe lines on both sides based on the optimum installation position of the deformed section Need to be cut without. In addition, if there is an insertion or receiving port at one end of the deformed tube and no processing is performed at the other end, cut the end on the side where the insertion port is provided as much as possible. It is reasonable to cut the end portion on the side where no insertion opening or the like is provided and connect it to the ducts on both sides.

JP-A-10-281358 (2nd page, FIG. 4)

  The invention described in Patent Document 1 is not a deformed tube having a deformed portion such as a branch port portion or a valve portion, but is simply cut into a predetermined length on the insertion side of the straight tube and cut. There is only disclosed an invention in which a new insertion opening is simply formed on the insertion opening side. In addition, it is not possible to find a document that discloses a technique relating to the length adjustment of a deformed pipe having a deformed portion such as a branch port or a valve portion.

  The present invention has been made in view of such a situation, and in a deformed pipe made of cast iron having a deformed portion such as a branch port portion, a valve portion, or a curved portion, the deformed tube that is easy to lay and the laying thereof It aims to provide a method.

In order to solve the above problems, the deformed tube of the present invention is
Branch port portion of the T-shaped in cross-section uniform straight line is formed, with the fluid tube is connected to both sides of the conduit, a profiled tube branch pipe is connected to the branch port portion,
A non-cutting portion for securing a length not to cause a trouble in order to connect a branch pipe to the branch port portion on both sides of the branch port portion of the pipe line, and extending from the non-cut portion are the length and cuttable portion for adjustment is formed Rutotomoni,
A mark is formed at a boundary between the non-cut portion and the cuttable portion of the pipe.
According to this feature, the length of the deformed pipe can be adjusted corresponding to the positions of the pipes on both sides of the deformed pipe after the branch port portion is positioned so as to be in the optimum predetermined installation position. The deformed part can be disposed at a predetermined position, and the pipe line can be laid quickly without cutting the pipe lines connected to both sides of the deformed pipe. Further, it is possible to perform cutting for length adjustment while preventing cutting that impairs the function of the deformed tube.

The deformed pipe of the present invention is
A valve portion is provided at the branch port portion .
According to this feature, the valve portion can be disposed at an optimal predetermined installation position, and the pipe line can be quickly installed without cutting the pipe line connected to both sides of the deformed pipe. It can be carried out.

The laying method of the deformed pipe of the present invention is
In this method, a T-shaped branch port is formed in a straight pipe having a uniform cross section, a fluid pipe is connected to both sides of the pipe, and a branch pipe is connected to the branch port. And
The deformed pipe has a non-cut portion for securing a length so as not to hinder the connection of the branch pipe to the branch port portion on both sides of the branch port portion, and extends from the non-cut portion. A cuttable portion for length adjustment is formed, and a mark is formed at the boundary between the non-cut portion and the cuttable portion of the pipe line,
The branch port portion so as to fit in a predetermined position relative to the branch pipe, cut at least one of the cleavable unit,
The fluid pipes arranged on both sides of the deformed pipe are connected to pipes on both sides of the deformed pipe via a joint or a push ring without being cut .
According to this feature, in a deformed pipe having a branch port portion, the deformed section is positioned so as to be in an optimum predetermined installation position, and then the pipe positions on both sides of the deformed pipe are respectively corresponded. Since the length of the deformed pipe can be adjusted, the deformed portion can be set at a predetermined position, and the deformed pipe can be connected to the pipes connected to both sides of the deformed pipe through the joint ring or push ring without cutting. The pipes on both sides of the pipe can be connected, and the laying work of the deformed pipe can be easily and reliably performed. Further, it is possible to perform cutting for length adjustment while preventing cutting that impairs the function of the deformed tube.

(A), (b) is a front view which shows an example of the unusual shape pipe | tube in Example 1. FIG. (A), (b) is front sectional drawing which shows the modification of a deformed pipe. (A), (b) is front sectional drawing which shows the other modification of a deformed pipe. (A)-(c) is a figure explaining an example of the laying method of the deformed pipe shown in FIG. It is a front view of the partial cross section which shows an example of the deformed pipe | tube in Example 2. FIG.

  EMBODIMENT OF THE INVENTION The form for implementing the deformed pipe which concerns on this invention, and its laying method is demonstrated below based on an Example.

  The deformed pipe and its laying method according to the first embodiment will be described with reference to FIGS. 1 (a) and 1 (b). 1 (a) and 1 (b), a deformed pipe 1 is a ductile cast iron or other cast iron pipe buried in the ground, and in which clean water flows as a fluid, and has a straight shape. And has a branch port portion 2 constituting a deformed portion at a substantially intermediate position in the length direction. The branch port 2 is provided with a flange 3, and a blind flange 4 is fixed to the flange 3 with a bolt 5 in a sealing manner via a packing or the like. If necessary, if the blind flange 4 is removed and a flange of another branch pipe (not shown) is attached to the flange 3, a T-shaped branch pipe can be laid. In the present embodiment, the fluid in the deformed pipe 1 is clean water, but the fluid flowing in the deformed pipe 1 is not necessarily limited to clean water, for example, industrial water, sewage, or other gases, gases and liquids. The gas-liquid mixture may be used.

  Here, the “deformed pipe” in the present invention will be described. In the present invention, the “deformed pipe” has, for example, a bent pipe shape, a branched pipe, a valve body attached, an insertion or receiving shape. It is a general term for tubes having various deformed portions, and the shape of the cross section of the tube includes a circular shape or a rectangular shape, and is not particularly limited.

  As shown in FIG. 1A, the deformed pipe 1 has a minimum length L1 (hereinafter referred to as “minimum required length L1”) on both the left and right sides with the branch port 2 as the center. It is set and has a cutting allowance L2 for length adjustment in addition to the minimum required length L1. In this case, the minimum required length L1 is a length that is necessary so as not to hinder the work when the branch pipe is connected to the branch port portion 2, and is usually the same length on the left and right. The left and right minimum required lengths L1 may be changed as necessary. An identifiable mark 6 is attached to the position of the minimum required length L1, that is, the maximum cuttable portion of the cutting allowance. As an identifiable mark, a colored line or the like is directly attached to the deformed tube, or a tape or the like is adhered to the deformed tube, or the position of the mark 6 is used as a boundary. Various things, such as giving a color mutually different to an area | region, are employable. Therefore, the cutting allowance L2 means a maximum cuttable portion.

  On the other hand, the cutting allowance L2 adjusts the length of the pipe line connected to both sides of the deformed pipe 1 in order to install the branch port portion 2 of the deformed pipe 1 at an optimum predetermined installation position, This is an adjustment allowance for adjusting the length of the deformed pipe 1 itself and connecting it to the pipes on both sides when the change is not desirable, and the length that is actually cut at the work site depends on the site where the deformed pipe is installed. Accordingly, it is determined within the range of the cutting allowance L2, and if the cutting allowance L2 is set too large, the cost will be increased. The lengths of the left and right cutting margins L2 of the deformed tube 1 may be the same or different.

  FIG. 1B shows a state in which the deformed tube 1 is cut to a required length within the range of the left and right cutting margins L2. Since the metal base is exposed on the cut surface 7 of the deformed pipe 1, it is necessary to perform a corrosion prevention process at the construction site. In particular, when using a detachment prevention type pipe joint, the fitting groove and the tapered cutting surface are formed on the outer periphery of the insertion slot at the end, and the insertion projection is fitted into the fitting groove. The metal base of the fitting groove and the tapered cutting surface is greatly exposed. For this reason, the anticorrosion process from the cut surface 7, the fitting groove, and the tapered cutting surface to the rear is indispensable. This anticorrosion processing can be done by applying anticorrosive paint at the construction site by brush or spray, applying thermal spraying, fitting a rubber cap, or by heating the heat shrinkable tube to shrink it. Selected and constructed.

  As described above, the branch pipe (not shown) connected to the branch port portion 2 of the deformed pipe 1 can be disposed at an optimal predetermined installation position, and the pipe connected to both sides of the deformed pipe 1 Pipes can be laid quickly without cutting.

  FIGS. 2A and 2B are front sectional views showing a modified example of the deformed pipe in the first embodiment. 2 (a) and 2 (b), the deformed pipe 51 has a T-shaped branch port portion 10, and a valve body 11 is provided in the branch port portion 10. When the valve shaft 12 is operated from the ground, the flow path 13 can be switched to the fully open position 14, the fully closed position 15, and the branch position 16. That is, the valve body 11 and the valve shaft 12 constitute a valve portion that is a deformed portion of the present invention. In this example, the present invention is not limited to the case where a valve body is provided at the T-shaped branch port, and includes, for example, a case where a valve body that is turned on and off is provided in the middle of a straight pipe. The point is that the valve portion constitutes a deformed portion.

  In FIG. 2A, the branch port portion 10 and the valve body 11 are provided at the approximate center in the longitudinal direction of the deformed tube 51, and the branch port portion 10 and the valve body 11 are centered on the left and right sides, respectively. A minimum required length L1 is set, and in addition to the minimum required length L1, a cutting margin L2 for adjusting the length is provided. The technical significance of the minimum necessary length L1 and the cutting allowance L2 is the same as in the case of FIG. An identifiable mark 6 is attached to the position of the minimum required length L1, that is, the maximum cuttable portion of the cutting allowance.

  FIG. 2B shows a state in which the deformed tube 51 is cut to a necessary length within the range of the left and right cutting margins L2. Of course, when the fitting groove and the tapered cutting surface are formed at the end portion of the cut surface 7, the anticorrosion paint is applied to these portions with a brush or spray at the construction site, or a thermal spraying process is performed. Corrosion-proof means for applying a rubber cap or heating and shrinking the heat-shrinkable tube is applied.

  As described above, the valve body 11 and the valve shaft 12 which are the valve portions of the deformed pipe 51 can be disposed at the optimum predetermined installation positions, and the pipes connected to both sides of the deformed pipe 51 are cut. It is possible to lay pipes quickly without applying them.

  3A and 3B are front views showing other modified examples of the deformed pipe in the first embodiment. 3 (a) and 3 (b), the deformed tube 52 has a bent portion 17 having a bending angle θ of 90 °, and the bent portion 17 constitutes the deformed portion. The bending angle θ can take an arbitrary value. In FIG. 3 (a), minimum required lengths L1 are set on both the left and right sides of the bent portion 17 of the deformed pipe 52, and in addition to the minimum required length L1, cutting for adjusting the length is performed. Has a bill L2. The technical significance of the minimum necessary length L1 and the cutting allowance L2 is the same as in the case of FIG. An identifiable mark is attached to the position of the minimum required length L1, that is, the maximum cuttable portion 6 of the cutting allowance.

  FIG. 3B shows a state where the right and left cutting margins L2 of the deformed tube 52 are cut to a required length. Of course, when the fitting groove and the tapered cutting surface are formed at the end portion of the cut surface 7, the anticorrosion paint is applied to these portions with a brush or spray at the construction site, or a thermal spraying process is performed. Corrosion-proof means for applying a rubber cap or heating and shrinking the heat-shrinkable tube is applied.

  As described above, the bent portion 17 of the deformed pipe 52 can be disposed at an optimum predetermined installation position, and the pipe line connected to both sides of the deformed pipe 52 can be laid without cutting. Can be done quickly.

  4A to 4C are diagrams for explaining an example of a method for laying the deformed pipe shown in FIG. FIG. 4A shows that the right end of the deformed tube 1 is connected to the right side of the deformed tube 1 after it has been cut to a predetermined length that can be joined to the left and right conduits connected from the branch port 2 as a starting point. Connected to the receiving port 31 of the fluid pipe 30 constituting the pipe line, and the left end of the deformed pipe 1 is connected to the fluid pipe 32 constituting the left pipe line via the moving joint 33 having a separation preventing mechanism. It shows the situation. In this case, it goes without saying that anticorrosive means such as application of anticorrosive paint is applied to the cut portion of the deformed tube 1. In this laying method, the fluid pipes 32 and 30 constituting the left and right pipe lines are previously arranged so as not to move in the pipe axis direction.

  In FIG. 4A, an insertion port 20 to be inserted into the inside of the receiving port 31 is formed at the right end portion of the deformed tube 1 connected to the receiving port 31. A flange 34 is integrally formed on the outer periphery of the opening of the receiving port 31, and a taper-shaped sealing material pressure contact surface (illustrated) that gradually increases in diameter toward the opening end on the inner periphery of the opening of the receiving port 31. Abbreviation) is formed. An annular rubber sealing material 21 is fitted on the insertion opening 20, and this sealing material 21 is arranged between the outer peripheral surface 22 of the insertion opening 20 and the sealing material pressure contact surface of the receiving opening 31. It has become.

  A push ring 23 having a detachment preventing mechanism as an annular body is externally fitted to a portion of the insertion opening 20 closer to the branch opening 2 than the sealing material 21. The push wheel may be formed in an annular shape that is continuous in the circumferential direction, or may be configured to be divided into a predetermined number along the circumferential direction, and the divided portions joined by bolts or the like. Flange 24 is formed at a plurality of positions along the circumferential direction of push wheel 23. Then, as shown in FIG. 4B, the fastening element 25 is disposed across the flange 24 of the push wheel 23 and the flange 34 of the receiving port 31. Reference numeral 26 denotes a pressing bolt, and the pressing bolt 26 bites a pressing claw (not shown) disposed in the pressing wheel 23 into the outer periphery of the tube, and fixes the pressing wheel 23 at a predetermined position.

  As shown in FIG. 4B, when the receiving port 31 and the insertion port 20 are joined to each other, the insertion claw 20 formed by cutting within the range of the cutting allowance of the deformed tube 1 is preliminarily provided with a pressing claw. The press ring 23 that accommodates the sealing member 21 and the sealing material 21 are fitted on each other, and the insertion port 20 in this state is inserted into the receiving port 31. Then, the press ring 23 is fastened to the flange 33 of the receiving port 31 by the fastening element 25, thereby compressing the sealing material 21 and fixing the press ring 23. Next, by operating the pressing bolt 26, the pressing claw is pressed and fixed to the outer peripheral surface 22 of the insertion opening 20, and the joining operation of the receiving opening 31 and the insertion opening 20 is completed. Note that a filler may be filled in a gap between the push wheel 23 and the outer peripheral surface 22 of the insertion opening 20.

  Next, a fluid pipe 32 constituting a left pipe line is connected to the left end of the deformed pipe 1 via a moving joint 33. In FIGS. 4 (a) and 4 (b), the moving joint 33 is provided. Is loosely fitted on the outer peripheral surface of the left fluid pipe 32, and a waiting state is shown. The moving joint 33 includes joint portions 35 and 35 on both the left and right sides, and the joint portions 35 and 35 have the same structure, and their orientations are arranged symmetrically. As shown in FIG. 4 (c), the moving joint 33 moves to the deformed pipe 1 side and cuts within the large diameter part 36 of the right joint part 35 within the range of the cutting allowance of the deformed pipe 1. The formed straight end 37 on the left side is inserted and both are inserted through a seal member (not shown) fitted between the inner surface of the large diameter portion 36 and the outer peripheral surface of the left side straight end 37 of the deformed tube 1. Are fitted in a sealed manner and fixedly connected by a push bolt 38. At the same time, the right straight end 39 of the fluid pipe 32 is disposed in the large diameter part 36 of the left joint part 35, and the inner surface of the large diameter part 36 and the outer peripheral surface of the right straight end 39 of the fluid pipe 32 Both are fitted in a sealed manner through a seal member (not shown) inserted between them and fixedly connected by a push bolt 38.

  As described above, when the deformed pipe 1 is laid, it is not necessary to perform processing for laying the right-side fluid pipe 30 and the left-side fluid pipe 32 provided with the receiving port 31 integrated with the separation preventing mechanism. The laying is performed by cutting as much as necessary within the range of the cutting allowance on the left and right sides of the deformed tube 1. At that time, since the cutting lengths on both sides of the deformed pipe 1 can be determined based on the position of the branch port portion 2, the position of the branch port portion 2 can be disposed at a predetermined position. In addition, since the maximum cuttable portion of the deformed tube 1 is marked, it is not accidentally cut too much, so that the work at the site can be performed safely and reliably.

  In the laying example shown in FIG. 4, an example is shown in which an insertion port is provided in one of the deformed pipes 1 and the other is connected by a joint ring. However, the present invention is not limited to this, for example, A mode in which an insertion port is provided in both, a mode in which one of the deformed pipes is a receiving port and the other is a loading port, a mode in which one of the deformed tubes is a flange and the other is a loading port, a mode in which a receiving port is provided in both of the shaped tubes Or it cannot be overemphasized that it can respond to various aspects, such as the aspect which connects both of a deformed pipe via a joint ring.

  Next, the separation preventing means according to the second embodiment will be described with reference to FIG. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted.

  The deformed tube 53 shown in FIG. 5 is different from FIG. 1 in that an insertion port 40 for connecting a tube is integrally formed at one end of the deformed tube 53, but the other configuration is the same as that of the deformed tube 1 of FIG. . Therefore, in this example, the branch port portion 2 and the insertion port portion 40 are deformed portions of the deformed tube 53. In FIG. 5, since the insertion portion 40 that is a deformed portion is integrally provided in the right portion of the branch port portion 2 of the deformed tube 53, a cutting allowance for adjusting the length cannot be provided. The cutting margin for adjusting the length is provided only in the left portion of the branch port portion 2, and a state where cutting is actually performed within the cutting margin is shown. In order to protect the cut portion 49 on the left side of the deformed tube 53, a cap 50 made of resin and rubber is fitted into the cut portion 49.

  Between the insertion port 40 on the right side of the deformed pipe 53 and the receiving port 42 of the fluid pipe 41 constituting the right pipe line fitted and connected thereto, the outer peripheral surface of the insertion port 40 and the receiving port The elastic sealing material 43 made of an annular synthetic rubber that can seal between the inner peripheral surface of the 42 is provided, and a plurality of outer peripheral surfaces of the insertion portion 40 that are equally spaced in the circumferential direction At locations (eight locations in the present embodiment), joining projections 44 are formed that come into contact with the end face of the receiving port 42 from the tube axis direction.

  A locking member 46 made of stainless steel that is elastically deformable to the enlarged diameter side formed in a substantially C shape when viewed from the tube axis direction in an annular mounting groove 45 formed on the inner peripheral surface of the receiving port 42. And an elastic holding ring 47 that holds the locking member 46 coaxially with the receiving opening 42 in a state in which this diameter expansion deformation is allowed, and at the tip of the outer peripheral surface of the insertion opening 40 When both pipes 1 and 41 move relative to each other more than a certain amount due to an earthquake, uneven settlement, etc., both the pipes 1 are brought into contact with the locking member 46 from the tube axis direction. , 41 is integrally formed with an annular retaining protrusion 48 for preventing relative disengagement movement.

  In order to lay the deformed pipe 53, the cutting margin on the left side of the deformed pipe 53 is cut to a predetermined length that can be joined to the left and right fluid pipes 32, 41 of the deformed pipe 53, and the insertion portion 40 of the deformed pipe 53 is formed. It is inserted into the receiving port 42 of the fluid pipe 41. Next, as in the first embodiment, the left fluid pipe 32 is connected to the left end of the deformed pipe 53 via the moving joint 33.

  According to the second embodiment, the insertion portion 40 for connecting the pipe is provided at the other end different from the one end provided with the cutting allowance for the deformed tube 53 in advance in a factory or the like, and the anticorrosion processing is performed. Therefore, at the laying site, it is only necessary to cut one end of the deformed pipe 53 to a required length and apply a corrosion-proofing process, so that the processing work at the laying site is minimized. be able to. In FIG. 5, the case where the insertion port 40 is integrally provided as a deformed portion at the other end of the deformed tube 53 is shown. However, the deformed portion is not limited to this, and for example, the receiving portion is replaced with the insertion port 40. You may provide integrally.

  In addition, according to the method of laying the deformed pipe 53 of the second embodiment, after positioning the branch port portion 2 and the insertion portion 40 which are the deformed portions so as to be within an optimum predetermined installation position, Since the length of the deformed tube 53 can be adjusted to correspond to the positions of the ducts on both sides, the branch port 2 and the insertion port 40 can be set at predetermined positions, and the tubes connected to both sides of the deformed tube 53 Without cutting the road, it is possible to connect to the pipes on both sides of the deformed pipe 53 via the moving joint 33 or the push ring, and the laying work of the deformed pipe 53 can be easily and reliably performed. .

  As described above, according to the modified tubes 1 and 51 to 53 of the present invention, the branched port portion 2, the branched port portion 10, the valve body 11, the valve shaft 12, the bent portion 17, or the insertion portion 40, which are deformed portions. Can be adjusted to correspond to the positions of the pipes on both sides of the deformed pipe, and each deformed portion can be adjusted to a predetermined position. In addition, the pipes can be laid quickly without cutting the pipes connected to both sides of the deformed pipe.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, as the deformed portion of the present invention, the deformed tube 1 has the branch port portion 2, the deformed tube 51 has the branch port portion 10, the valve body 11 and the valve shaft 12, and the deformed tube 52. Has the bent portion 17 and the deformed tube 53 further has the insertion portion 40. For example, one deformed tube is formed as a deformed portion, such as a branch port portion, a valve portion, a bent portion, and an insertion portion. Etc. may be combined.

1 Modified Pipe 2 Branch Port 6 Mark 7 Cut Surface 10 Branch Port 11 Valve Element (Valve)
12 Valve stem (valve part)
17 bent portion 20 insertion port 30 fluid tube 31 receiving port 32 fluid tube 33 moving joint 37 straight end portion 40 insertion port 41 fluid tube 42 receiving port 49 cutting portions 51 to 53 deformed tube

Claims (3)

Branch port portion of the T-shaped in cross-section uniform straight line is formed, with the fluid tube is connected to both sides of the conduit, a profiled tube branch pipe is connected to the branch port portion,
A non-cutting portion for securing a length not to cause a trouble in order to connect a branch pipe to the branch port portion on both sides of the branch port portion of the pipe line, and extending from the non-cut portion are the length and cuttable portion for adjustment is formed Rutotomoni,
The deformed pipe is characterized in that a mark is formed at a boundary between the non-cut portion and the cuttable portion of the pipe.   The deformed pipe according to claim 1, wherein a valve portion is provided at the branch port portion. In this method, a T-shaped branch port is formed in a straight pipe having a uniform cross section, a fluid pipe is connected to both sides of the pipe, and a branch pipe is connected to the branch port. And
The deformed pipe has a non-cut portion for securing a length so as not to hinder the connection of the branch pipe to the branch port portion on both sides of the branch port portion, and extends from the non-cut portion. A cuttable portion for length adjustment is formed, and a mark is formed at the boundary between the non-cut portion and the cuttable portion of the pipe line,
The branch port portion so as to fit in a predetermined position relative to the branch pipe, cut at least one of the cleavable unit,
A method for laying a deformed pipe, characterized in that the fluid pipes arranged on both sides of the deformed pipe are connected to pipes on both sides of the deformed pipe via a joint or a push ring without being cut .

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